HF generator experience. I installed one in a friends horse shoeing trailer. Seemed like a nice little generator for the money. Then he started it, the noise scared the horses, it rattled the entire trailer, and the pull started hanging up after the first eight or ten times used. He tried to get parts for it (pull cord mechanism), was never able to get it. Tried to return it to HF. They said that even though the pull cord hung up some times, it still worked, so he had to work with the manufacturer . . . Manufacturer wouldn't return e-mails, and no phone number provided. He ended up replacing it with a Honda from the same place that I purchased my two:
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I would recommend Honda, but I've heard some really good things about Yamaha as well. I don't have any personal or anecdotal experience with Champions, so I'll stay out of that one!
I would avoid Generac. Google Generac problems and you'll have more than an afternoon's reading. Just saying!
Good luck in whatever you decide, but please post what you buy and your experience with it! Take care,